<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<style>

/* use attribute selector instead of the .class shorthand to work around bug 379178 */

*[class="fixed"] { position: fixed; }

math, mtable, mtr { position: inherit; }

</style>
</head>

<body>

<div class="fixed">
  <math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
    <mtable>
      <mtr class="fixed">
        <mtd><mi>x</mi></mtd>
      </mtr>
      <mtr>
        <mtd><mi>y</mi></mtd>
      </mtr>
    </mtable>
  </math>
</div>

</body>

</html>
